Biomechanics and Modeling in Mechanobiology

, Volume 11, Issue 1–2, pp 207–219 | Cite as

Biophysical stimuli induced by passive movements compensate for lack of skeletal muscle during embryonic skeletogenesis

  • Niamh C. NowlanEmail author
  • Gerard Dumas
  • Shahragim Tajbakhsh
  • Patrick J. Prendergast
  • Paula Murphy
Open Access
Original Paper


In genetically modified mice with abnormal skeletal muscle development, bones and joints are differentially affected by the lack of skeletal muscle. We hypothesise that unequal levels of biophysical stimuli in the developing humerus and femur can explain the differential effects on these rudiments when muscle is absent. We find that the expression patterns of four mechanosensitive genes important for endochondral ossification are differentially affected in muscleless limb mutants, with more extreme changes in the expression in the humerus than in the femur. Using finite element analysis, we show that the biophysical stimuli induced by muscle forces are similar in the humerus and femur, implying that the removal of muscle contractile forces should, in theory, affect the rudiments equally. However, simulations in which a displacement was applied to the end of the limb, such as could be caused in muscleless mice by movements of the mother or normal littermates, predicted higher biophysical stimuli in the femur than in the humerus. Stimuli induced by limb movement were much higher than those induced by the direct application of muscle forces, and we propose that movements of limbs caused by muscle contractions, rather than the direct application of muscle forces, provide the main mechanical stimuli for normal skeletal development. In muscleless mice, passive movement induces unequal biophysical stimuli in the humerus and femur, providing an explanation for the differential effects seen in these mice. The significance of these results is that forces originating external to the embryo may contribute to the initiation and progression of skeletal development when muscle development is abnormal.


Skeletal development Mechanobiology Mouse mutant Muscle contractions Finite element analysis 



We are grateful to Robert Hill, Edinburgh, UK, for RNA probes. This research was funded by the Wellcome Trust (083539/Z/07/Z), and by a grant from the French Embassy in Ireland (Service de Coopération et d’Action Culturelle). NCN was funded by a Marie Curie Intra European Fellowship within the 7th European Community Framework Programme and a fellowship from the Irish Research Council for Science, Engineering & Technology. The Tajbakhsh laboratory was funded by the Institut Pasteur and AFM.

Open Access

This article is distributed under the terms of the Creative Commons Attribution Noncommercial License which permits any noncommercial use, distribution, and reproduction in any medium, provided the original author(s) and source are credited.


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Copyright information

© The Author(s) 2011

Authors and Affiliations

  • Niamh C. Nowlan
    • 1
    • 2
    Email author
  • Gerard Dumas
    • 3
  • Shahragim Tajbakhsh
    • 3
  • Patrick J. Prendergast
    • 1
  • Paula Murphy
    • 1
    • 4
  1. 1.Trinity Centre for BioengineeringSchool of Engineering, Trinity College DublinDublinIreland
  2. 2.EMBL/CRG Systems Biology Unit, Centre for Genomic Regulation (CRG) and UPFBarcelonaSpain
  3. 3.Stem Cells and Development, Department of Developmental BiologyInstitut PasteurParisFrance
  4. 4.Department of ZoologySchool of Natural Sciences, Trinity College DublinDublinIreland

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